1. A SIP Event Package for DTMF Event Monitoring draft-zebarth-sipping-dtmfad-00.txt IETF 58 Joe Zebarth, Vice Chair T1S1.7

2. This document: Was prepared on behalf of Committee T1 Defines A SIP Event Package for DTMF Event Monitoring Was prepared to support IANA Registration per RFC 3427 (BCP 67) Change Process for the Session Initiation Protocol

3. Event Package "DTMFAD" proposes use of SUBSCRIBE and NOTIFY to collect DTMF digits to implement: Committee T1 Technical Report T1.TR.82-2003 “SIP Network Operators Implementers Guide for Pre-Paid Calling Card, with DTMF Detection at the PSTN-IP Gateway”

4. Usage Scenario This event package MAY be used to allow an Application server (subscriber) to request DTMF monitoring and notification of detection from a receiving agent (notifier) in order to enable a caller-initiated re-origination request while a call is in progress. It is recognized that there may be other possible applications of this event package.

5. This document: Defines new Event Header Field parameters: duration event-set maxrate Defines a new MIME type: application/DTMF-event Was prepared to support IANA Registration per RFC 3427 (BCP 67) Change Process for the Session Initiation Protocol

6. Characteristics of Event Package Very Simple Compact

7. Relationship to KPML Event Package Less sophisticated Simpler Processing intensity at different locations KMPL package requires processing intensity at the Notifier DTMFAD package requires processing intensity at the Application Server Seen as complementary, not competitive

8. Our desire: This ID be published as an Informational RFC so that IANA registration of this event package can be obtained

9. Thank You

10. Duration Parameter: An optional parameter that: defines the duration of a continuous DTMF tone (in milliseconds) that will cause the notifier to send a NOTIFY request before detecting the end of the tone If omitted requires event notification to occur only when the end of the DTMF tone is detected Recommended that this parameter be omitted for normal implementations to reduce messages

11. Maxrate Parameter: An optional parameter defining a maximum number of NOTIFY transactions per minute initiated to report DTMF events. If "maxrate" is omitted, the notifier MUST limit reporting to forty (40) NOTIFY transactions per minute When defined SHOULD NOT exceed 60. For this particular usage scenario this parameter may be omitted

12. Event-set Parameter: An optional parameter that: defines the set of events that are to be detected by the notifier If omitted, it must detect the following set of events: digits 0 through 9 (decimal 0-9) the * key (hexadecimal a) the # key (hexadecimal b); and special digits A through D (hexadecimal c-f) For this particular usage scenario this parameter may be omitted

13. Defines a new MIME type: MIME media type name: application MIME subtype name: DTMF-event Mandatory parameters: none Optional parameters: none Encoding considerations: binary encoding scheme Notifier shall encode DTMF-event as four octets 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | event |E|R| volume | duration | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+